rims tires compared to stock tires

to take advantage of that extra contact surface!

Seriously, why go half way? Go full circle and build a real car.

There shouldn't be a problem w/ balancing the tires.  Might be more dificult for the tire place and they might charge you more but they should be able to do it.  And yeah NowYaKnow probably right w/ the brakes.  Upgrade them.  It's a kinda complicated physics explination of eqations.  Also it lookes kinda retarded if you have huge rims and little dinky stock disk/drum breaks inside that are like 1/4 the size of the rims.

Actually a larger contact surface would mean easier braking b/c there is more area of the nonmoving group of particles trying to resist motion compared to a smaller tire w/ less contact surface, therefore less area for the nonmoving object to grip. 

But let's say you have ABS.  Then bravo to Ravendarat.  The 22" has more mass then the stock (let's say 16").  And a 22" rim has a greater rotational velocity at it's edge.  Greater mass, greater velocity all equal a greater momentum.  Greater momentum means you need a greater force counteracting the momentum (a bigger brake).  Gotta love physics and dynamics.

I was just thinking about this today...

larger rims don't always wiegh much more than stock rims. Some can be very light, I'm assuming these rims are lightwieght, otherwise what's the point?

The problem most likely comes form the majority of the wieght being further away from the center, having stronger momentum against the brakes. I'm no physics expert, but I relate this to using a breaker bar over a stubby wrench, which is easier to turn?

A few good reasons to upgrade the brakes, most have been mentioned:

1. Don't expose weakness......showing off stock drums and rotors with large rims is uncool....it looks like you spent all of your money on rims and ran out of steam. It also looks like the car is trying to be something it can't be, because it can't.

2. Stock brakes suck anyways....at least upgrade the pads and hoses (steel braid)

3. the rims will be harder on the brakes, enter formulas for rotational force here:

I have a whole book of this from NEMA, it's an engineering pocket book, it's fascinating!

4. These tires will have better hanfling, braking and handling go hand in hand...otherwise there is an unbalance in performance.

5. Safety, don't you want to know your car will stop when and where you want it to stop?

Just think, if you encountered a deer, multi car pile-up at 70 mph, stupid drivers, drunk drivers running red lights...ect.. would you be able to stop?

6. Deceleration can be just as much fun as acceleration......once and a while :D

Came here to talk car audio got a physics lesson.

But they are right...( A little math for you) Big Rims +  Small brakes = No stopping power...

Lower profile tires tend to have softer tread compound.. meaning they 'stick' better to the road. They also wear out faster. Look at the wear rating on the tire.. The Michelins Harmonys we have on a couple of our cars have a rating of 560. A Michelin Pilot in the same size may have a rating of only 180. The higher the number the longer the tire will last. www.tirerack.com should have a pretty good article on this.. look for 'tire ratings'.

 Balancing a large diameter rim isn't really any different than a 'normal' sized one.. the ability of a shop to balance (and mount) any particular rim size will be determined by what equipment they use.  Same for alignment.. shop equipment might not be able to handle a 22" rim, just put the stock rims back on the car for the alignment, then put the big rims back on. Shouldn't be any problems.

 WRT brakes.. when changing rim or tire size, consider the Outside Diameter of the tire.. this determines the revolutions per mile of the tire. A tire sized 205/55-16 has the same OD (and RPM) of a tire sized 185/75-14.  The car won't know the difference. But when you start increasing the OD of the tire over the stock size you start seeing problems with speedometer inaccuracy, possible ABS problems and acceleration problems, as well as possible problems in other areas.

 But in a quick google search, I'm not seeing any warnings on big rims causing brake problems.. about the only thing I can think of is that a larger OD would cause a slower rotor RPM at any given speed vs. stock tire OD, but I don't know if that would cause problems. Weight wouldn't really be a concern WRT braking; that's more of a suspension issue.

 If anyone can post links to warnings/tech articles, I'd be happy to learn..

 Hope this helps,

 Jim

From a performace standpoint, upgrading (disc) brakes would start with a better quality brake pad; maybe a upgraded rotor in the same size as the OEM brake rotor. That'll cover 90 something percent of the people out there driving on the street. For the few people who need better brakes because what they've got isn't getting the job done (driving serious on a track), you start looking at multi piston calipers and bigger rotors - ie. a 'big brake' setup.

 To fill up a set of big rims,  jump directly to a set of 'big brakes'. Bring your wallet. Bigger diameter rotors, new calipers painted shiny with someone's name on them, new pads, and possibly other stuff.

 Here's a kit for 7th generation Civics..

https://www.7thgencivic.com/parts_reviews/showproduct.php/product/73

 $1700.

 01-04 Sub WRX - $2395.

https://www.stillen.com/brakepros_detail.asp?id=32348&main=1

 Regards,

 Jim